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Fair Value Measurements - Fair Value Inputs, Liabilities, Quantitative Information (Details) (Contingent Consideration, USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended
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Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2014 Income Approach Valuation Technique Fair Value, Inputs, Level 3 | Jun. 30, 2014 Minimum Income Approach Valuation Technique Fair Value, Inputs, Level 3 | Jun. 30, 2014 Maximum Income Approach Valuation Technique Fair Value, Inputs, Level 3 | Jun. 30, 2014 Revenue-based Payments | Jun. 30, 2014 Revenue-based Payments Income Approach Valuation Technique Fair Value, Inputs, Level 3 | Jun. 30, 2014 Other Payments | Jun. 30, 2014 Other Payments Income Approach Valuation Technique Fair Value, Inputs, Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  | 5.40% | 11.00% | 15.00% |  |  |  |
Contingent consideration liability | $ 2,507 | $ 2,513 | $ 2,526 | $ 6,692 | $ 6,694 | $ 6,697 |  |  |  | $ 2,255 |  | $ 252 |
Probability of milestone payment |  |  |  |  |  |  |  |  |  |  | 90.00% |  | 100.00%

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- Definition Fair Value Inputs, Probability of Milestone Payment + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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